Systems and methods for location estimation in spread spectrum communication systems
First Claim
1. A system for estimating a position location of a mobile station in a spread spectrum system, comprising:
- a processing engine configured to selectively and substantially cancel one or more interfering signals from a digital signal and to generate one or more interference cancelled output signals;
a receiver communicatively coupled to the processing engine and configured for processing the one or more interference cancelled output signals to generate signaling information; and
a location processor configured to process the signaling information to generate a location estimate.
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Abstract
Systems and methods for assisting in location estimation are presented. In one embodiment of the invention, a system improves performance of known location determination algorithms through the use of interference cancellation. In general, the system selectively cancels certain signals to improve Signal to Noise Ratios (SNRs) of certain other signals in a spread spectrum system. These improved SNRs enhance processing, which assists in ascertaining a location of a mobile handset. For example, with improved SNR, the handset may be more able to process signals from more base stations. This processing of additional signals can improve location estimation because certain known location determination algorithms can be used (e.g., TOA and AOA) and location ambiguities and can be resolved.
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Citations
45 Claims
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1. A system for estimating a position location of a mobile station in a spread spectrum system, comprising:
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a processing engine configured to selectively and substantially cancel one or more interfering signals from a digital signal and to generate one or more interference cancelled output signals;
a receiver communicatively coupled to the processing engine and configured for processing the one or more interference cancelled output signals to generate signaling information; and
a location processor configured to process the signaling information to generate a location estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of estimating a location of a mobile station in a spread spectrum system, comprising:
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processing a first signal to generate signaling information of the first signal in response to receiving a location request;
substantially canceling the first signal to process a second signal and to generate signaling information of the second signal; and
generating a location estimate from the signaling information of the second signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method of estimating a position location of a mobile station in a spread spectrum system, comprising:
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processing a first signal to generate signaling information of the first signal;
determining if substantially canceling the first signal improves signal quality in a second signal;
substantially canceling the first signal to process the second signal and to generate signaling information of the second signal in response to determining that the signal quality of the second signal is improved; and
generating a location estimate using the signaling information of the second signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A system for estimating a location of a mobile station in a spread spectrum system, comprising:
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means for processing a first signal to generate signaling information of the first signal in response to receiving a location request;
means for substantially canceling the first signal to process a second signal and to generate signaling information of the second signal; and
means for generating a location estimate from the, signaling information of the second signal. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A system for estimating a position location of a mobile station in a spread spectrum system, comprising:
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means for processing a first signal to generate signaling information of the first signal;
means for determining if substantially canceling the first signal improves signal quality in a second signal;
means for substantially canceling the first signal to process the second signal and to generate signaling information of the second signal in response to determining that the signal quality of the second signal is improved; and
means for generating a location estimate using the signaling information of the second signal. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
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Specification